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/* Kernel Object Display facility for Cisco

   Copyright 1999 Free Software Foundation, Inc.

   Written by Tom Tromey <tromey@cygnus.com>.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "defs.h"

#include "gdb_string.h"

#include "kod.h"

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

/* Define this to turn off communication with target.  */

/* #define FAKE_PACKET */

/* Size of buffer used for remote communication.  */

#define PBUFSIZ 400

/* Pointers to gdb callbacks.  */

static void (*gdb_kod_display) (char *);

static void (*gdb_kod_query) (char *, char *, int *);

/* Initialize and return library name and version.

   The gdb side of KOD, kod.c, passes us two functions: one for

   displaying output (presumably to the user) and the other for

   querying the target.  */

char *

cisco_kod_open (kod_display_callback_ftype *display_func,

                kod_query_callback_ftype *query_func)

{

  char buffer[PBUFSIZ];

  int bufsiz = PBUFSIZ;

  int i, count;

  gdb_kod_display = display_func;

  gdb_kod_query = query_func;

  /* Get the OS info, and check the version field.  This is the stub

     version, which we use to see whether we will understand what

     comes back.  This is lame, but the `qKoL' request doesn't

     actually provide enough configurability.

     Right now the only defined version number is `0.0.0'.

     This stub supports qKoI and the `a' (any) object requests qKaL

     and qKaI.  Each `a' object is returned as a 4-byte integer ID.

     An info request on an object returns a pair of 4-byte integers;

     the first is the object pointer and the second is the thread ID.  */

#ifndef FAKE_PACKET

  (*gdb_kod_query) ("oI;", buffer, &bufsiz);

#else

  strcpy (buffer, "Cisco IOS/Classic/13.4 0.0.0");

#endif

  count = 2;

  for (i = 0; count && buffer[i] != '\0'; ++i)

    {

      if (buffer[i] == ' ')

        --count;

    }

  if (buffer[i] == '\0')

    error ("Remote returned malformed packet\n");

  if (strcmp (&buffer[i], "0.0.0"))

    error ("Remote returned unknown stub version: %s\n", &buffer[i]);

  /* Return name, version, and description.  I hope we have enough

     space.  */

  return (xstrdup ("gdbkodcisco v0.0.0 - Cisco Kernel Object Display"));

}

/* Close the connection.  */

void

cisco_kod_close ()

{

}

/* Print a "bad packet" message.  */

static void

bad_packet ()

{

  (*gdb_kod_display) ("Remote target returned malformed packet.\n");

}

/* Print information about currently known kernel objects.

   We currently ignore the argument.  There is only one mode of

   querying the Cisco kernel: we ask for a dump of everything, and

   it returns it.  */

void

cisco_kod_request (char *arg, int from_tty)

{

  char buffer[PBUFSIZ], command[PBUFSIZ];

  int done = 0, i;

  int fail = 0;

  char **sync_ids;

  int sync_len = 0;

  int sync_next = 0;

  char *prev_id = NULL;

  if (! arg || strcmp (arg, "any"))

    {

      /* "Top-level" command.  This is really silly, but it also seems

         to be how KOD is defined.  */

      /* Even sillier is the fact that this first line must start

         with the word "List".  See kod.tcl.  */

      (*gdb_kod_display) ("List of Cisco Kernel Objects\n");

      (*gdb_kod_display) ("Object\tDescription\n");

      (*gdb_kod_display) ("any\tAny and all objects\n");

      return;

    }

  while (! done)

    {

      int off = 0;               /* Where we are in the string.  */

      long count;               /* Number of objects in this packet.  */

      int bufsiz = PBUFSIZ;

      char *s_end;

      strcpy (command, "aL");

      if (prev_id)

        {

          strcat (command, ",");

          strcat (command, prev_id);

        }

      strcat (command, ";");

#ifndef FAKE_PACKET

      /* We talk to the target by calling through the query function

         passed to us when we were initialized.  */

      (*gdb_kod_query) (command, buffer, &bufsiz);

#else

      /* Fake up a multi-part packet.  */

      if (! strncmp (&command[3], "a500005a", 8))

        strcpy (buffer, "KAL,01,1,f500005f;f500005f;");

      else

        strcpy (buffer, "KAL,02,0,a500005a;a500005a;de02869f;");

#endif

      /* Empty response is an error.  */

      if (strlen (buffer) == 0)

        {

          (*gdb_kod_display) ("Remote target did not recognize kernel object query command.\n");

          fail = 1;

          break;

        }

      /* If we don't get a `K' response then the buffer holds the

         target's error message.  */

      if (buffer[0] != 'K')

        {

          (*gdb_kod_display) (buffer);

          fail = 1;

          break;

        }

      /* Make sure we get the response we expect.  */

      if (strncmp (buffer, "KAL,", 4))

        {

          bad_packet ();

          fail = 1;

          break;

        }

      off += 4;

      /* Parse out the count.  We expect to convert exactly two

         characters followed by a comma.  */

      count = strtol (&buffer[off], &s_end, 16);

      if (s_end - &buffer[off] != 2 || buffer[off + 2] != ',')

        {

          bad_packet ();

          fail = 1;

          break;

        }

      off += 3;

      /* Parse out the `done' flag.  */

      if ((buffer[off] != '0' && buffer[off] != '1')

          || buffer[off + 1] != ',')

        {

          bad_packet ();

          fail = 1;

          break;

        }

      done = buffer[off] == '1';

      off += 2;

      /* Id of the last item; we might this to construct the next

         request.  */

      prev_id = &buffer[off];

      if (strlen (prev_id) < 8 || buffer[off + 8] != ';')

        {

          bad_packet ();

          fail = 1;

          break;

        }

      buffer[off + 8] = '\0';

      off += 9;

      if (sync_len == 0)

        sync_ids = (char **) xmalloc (count * sizeof (char *));

      else

        sync_ids = (char **) xrealloc (sync_ids,

                                       (sync_len + count) * sizeof (char *));

      sync_len += count;

      for (i = 0; i < count; ++i)

        {

          if (strlen (&buffer[off]) < 8 || buffer[off + 8] != ';')

            {

              bad_packet ();

              fail = 1;

              break;

            }

          buffer[off + 8] = '\0';

          sync_ids[sync_next++] = xstrdup (&buffer[off]);

          off += 9;

        }

      if (buffer[off] != '\0')

        {

          bad_packet ();

          fail = 1;

          break;

        }

    }

  /* We've collected all the sync object IDs.  Now query to get the

     specific information, and arrange to print this info.  */

  if (! fail)

    {

      (*gdb_kod_display) ("Object ID\tObject Pointer\tThread ID\n");

      for (i = 0; i < sync_next; ++i)

        {

          int off = 0;

          int bufsiz = PBUFSIZ;

          /* For now assume a query can be accomplished in a single

             transaction.  This is implied in the protocol document.

             See comments above, and the KOD protocol document, to

             understand the parsing of the return value.  */

          strcpy (command, "aI,");

          strcat (command, sync_ids[i]);

          strcat (command, ";");

#ifndef FAKE_PACKET

          (*gdb_kod_query) (command, buffer, &bufsiz);

#else

          strcpy (buffer, "KAI,");

          strcat (buffer, sync_ids[i]);

          strcat (buffer, ",ffef00a0,cd00123d;");

#endif

          if (strlen (buffer) == 0)

            {

              (*gdb_kod_display) ("Remote target did not recognize KOD command.\n");

              break;

            }

          if (strncmp (buffer, "KAI,", 4))

            {

              bad_packet ();

              break;

            }

          off += 4;

          if (strncmp (&buffer[off], sync_ids[i], 8)

              || buffer[off + 8] != ',')

            {

              bad_packet ();

              break;

            }

          off += 9;

          /* Extract thread id and sync object pointer.  */

          if (strlen (&buffer[off]) != 2 * 8 + 2

              || buffer[off + 8] != ','

              || buffer[off + 17] != ';')

            {

              bad_packet ();

              break;

            }

          buffer[off + 8] = '\0';

          buffer[off + 17] = '\0';

          /* Display the result.  */

          (*gdb_kod_display) (sync_ids[i]);

          (*gdb_kod_display) ("\t");

          (*gdb_kod_display) (&buffer[off]);

          (*gdb_kod_display) ("\t");

          (*gdb_kod_display) (&buffer[off + 9]);

          (*gdb_kod_display) ("\n");

        }

    }

  /* Free memory.  */

  for (i = 0; i < sync_next; ++i)

    free (sync_ids[i]);

  free (sync_ids);

}